Technical essentials of cotton formula fertilization

The growth of cotton is characterized by unlimited growth, strong regeneration ability, strong controllability of plant shape and large amount of fertilizer. Generally speaking, adequate fertilizer is the basis of high yield and high quality of cotton. Adequate phosphate fertilizer can promote the robust growth of cotton plants, increase boll weight and mature earlier. Potash fertilizer is the catalyst of a variety of enzymes in plants, which can promote photosynthesis and cellulose synthesis. The fertilization technology of cotton is the eight-character formula fertilizer application method of "regulating nitrogen, increasing potassium, supplementing phosphorus and spraying boron". Specifically, we should pay attention to the following five technical measures.

1. Attach importance to the application of farm manure. Farm manure can improve soil and soil fertility. Supplying various nutrient elements to crops and applying a certain amount of chemical fertilizer is a supplement and efficiency to farm manure. On this basis, the application of micro-fertilizer will have a significant synergistic effect. If farm manure or chemical fertilizer is not satisfied, the effect of micro-fertilizer is not significant.

two。 Adjust the proportion of nitrogen fertilizer. Farmers' long-term partial application of nitrogen fertilizer not only results in the loss and waste of nitrogen nutrients, but also makes the proportion of nitrogen, phosphorus and potassium seriously out of balance. According to different soil fertility, the application of nitrogen fertilizer was adjusted to 10~15kg (including organic nitrogen) every 667m2.

3. Increase the amount of potash fertilizer. The absorption of potassium from emergence to budding accounts for about 24% of the total amount of potassium in the whole growth period, 42% from budding to flowering, and 34% from flowering to maturity. Therefore, potash fertilizer should be applied on the basis or before budding to facilitate the early growth of cotton and to meet the needs of the growth and development of buds, flowers and bolls. In the later stage, potassium fertilizer (Hefeng potassium or phosphorus potassium power) can also be sprayed on the leaves to supplement potassium. The amount of potash fertilizer is increased to 10~15kg for every 667m2.

4. Supplement phosphate fertilizer. Phosphorus is not easy to move in the soil, and it is not easy to dissolve and release, and it is not easy to be absorbed by roots, so phosphate fertilizer can be used as a base fertilizer to produce fertilizer effect in the early growth stage. In production, nitrogen fertilizer is often mixed with phosphate fertilizer, and its fertilizer effect is much better than that of phosphate fertilizer alone. It can also be foliar sprayed with high-quality potassium dihydrogen phosphate (such as 99% phosphorus and potassium power imported from Singapore). The amount of phosphate fertilizer should be added to 20~30kg.

5. Spray boron fertilizer. Sufficient boron can not only promote floral organ development, pollinate and increase fruit rate, but also accelerate the transport of carbohydrates and increase the weight and lint percentage of single peach. Therefore, 1000 times of Hefeng boron solution should be sprayed at bud stage, early flowering stage and full flowering stage.